Mass Transfer
In saturated gas, the

Vapour is in equilibrium with the liquid at the room temperature
Vapour is in equilibrium with the liquid at the gas temperature
Partial pressure of vapour equals the vapour pressure of the liquid at room temperature
None of the listed here

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Mass Transfer
Solvent extraction is the terminology applied to the liquid-liquid extraction, which is preferred for the separation of the components of liquids, when

Extracting solvent is cheaply & abundantly available
Viscosity of liquid components is very high
One of the liquid components is heat sensitive
One of the liquid components has very high affinity towards the solvent

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